We have other boards in the Feather family, check'em out here The RP2040 Adalogger is the same size and shape as a Feather and is intended to make your next data logging or data... Add to Cart, Adafruit Feather RP2040 Adalogger - 8MB Flash with microSD Card - STEMMA QT / Qwiic...
sizeof(data type) returns the size in bytes of the data type sizeof(array)/sizeof(data type of array) gives you the number of elements in the array Extra: 2-dimensional arrays (Matrices) In an array, the elements can not only be data types, like ints, but also other arrays. This ...
}//END,RS485串口外设 连接 Modbus RTU//Set up ModbusRTU client.//- provide onData handler functionMB.onDataHandler(&handleData);//回调函数//- provide onError handler functionMB.onErrorHandler(&handleError);//回调函数//Set message timeout to 2000msMB.setTimeout(2000);//Start ModbusRTU bac...
使用通用输入,在Arduino中有2个函数,分别用于配置引脚模式和读引脚状态: void pinMode(pin_size_t pin, PinMode mode):设置引脚的输入状态,常用的mode有INPUT、INPUT_PULLUP、INPUT_PULLDOWN等;在上图的按钮应用中应该设置为 INPUT_PULLUP; PinStatus digitalRead(pin_size_t pin):读指定的pin的状态; 将前面的...
diode, there are positive and negative poles, here the positive pole of the LED is used to connect VCC (5V), that is, the positive pole of the power supply, and then connect a resistance in series between the power supply and the LED (current limiting and protection circuit, the size ...
2.2Data Types void boolean char unsigned char byte int unsigned int word long unsigned long float double string - char array String - object 3 array 2.3 Conversion char byte int word long float 2.4 Variable Scopeamp Qualifiers variable scope static volatile const 2.5 Utilities sizeof三Functions ...
//设置log打印 uint8_t* data = (uint8_t*) malloc(RX_BUF_SIZE+1); //申请动态内存 while (1) { const int rxBytes = uart_read_bytes(UART_NUM_0, data, RX_BUF_SIZE, 1000 / portTICK_RATE_MS);//读取数据 if (rxBytes > 0) { //判断数据长度 data[rxBytes] = 0; //清空data中的...
inline size_t write(long n) { return write((uint8_t)n); } inline size_t write(unsigned int n) { return write((uint8_t)n); } inline size_t write(int n) { return write((uint8_t)n); } using Print::write; /* Pin accessors */ ...
\Users\asus\AppData\Local\Arduino15\packages -built-in-libraries D:\arduino\libraries -libraries C:\Users\asus\Documents\Arduino\libraries -fqbn=esp8266:esp8266:nodemcuv2:CpuFrequency=80,UploadTool=esptool,UploadSpeed=115200,FlashSize=4M3M -vid-pid=10C4_EA60 -ide-version=10812 -build-path C:...
Keep as far as possible from noise sources (LED light bulb, computers and any device connected to the power grid) Try to find a suitable size for the antenna wire. Too long can be a big noise pickup. If too short, it may not be enough to pick up radio stations.When...